币界网报道：Bitcoin open interest has surged by 20% in the past week, reaching $18 billion, as traders anticipate heightened market volatility. The Chicago Mercantile Exchange (CME) now holds the largest share of BTC futures open interest at $4.7 billion, surpassing Binance. Analysts attribute this shift to growing institutional participation and the upcoming U.S. spot Bitcoin ETF decision. Bitcoin's 30-day volatility has spiked 25% to 3.5%, its highest level since November 2022, signaling potential price swings. "The market is positioning for a major move," noted a Deribit analyst, pointing to increased options activity with $5.8 billion in BTC options set to expire this Friday. The volatility surge coincides with Bitcoin's price hovering near $43,000 after a 15% rally in January.